Source Data Reference for:

City = Wroclaw
Time = 1800

City	Year	Size	Size Comment	Year Comment	Author	Title	Location
Wroclaw	1800	54,000			Jan De Vries	European urbanization 1500-1800	p272
Wroclaw	1800	64,000			Tertius Chandler	Four thousand years of urban growth	p23
Wroclaw	1800	64,000			Tertius Chandler	Four thousand years of urban growth	p486
Wroclaw	1800	60,000			Paul Bairoch	La population des villes europeennes de 800 a 1850
Wroclaw	1800	60,000			Brian Mitchell	International historical statistics